A method of accurately detecting the value of a dot of sensed image data, said image data comprising an array of dots and said sensed image data comprising a sampling of said image data at a rate greater than the pitch frequency of said array of dots so as to produce an array of pixels, said method comprising the steps of:. The invention includes a first base and a second base. Commands from the control system for safety tasks have priority over commands from the control system for operating tasks. A transmitted power of the microwave energy transmitted from the microwave source to the microwave heating chamber is measured with power sensors. , in a manner virtually transparent to the user.